The present invention relates generally to construction tools and tool accessories, and particularly to tools and tool accessories adapted to sand or smooth a surface.
Many construction applications require sanding or smoothing a working surface, such as the surface of a wooden board or the surface of drywall compound at a seam between adjacent drywall panels. The sanding process involves placing an abrasive article, such as a sanding sheet or block, into contact with the working surface, and then moving the abrasive article to level or smooth portions of the working surface by removing material from the working surface. It can be beneficial to maintain a desired angle of contact between the abrasive article and working surfaces while sanding to avoid inadvertently creating gouges or other noticeable imperfections in the working surface. Material removed from the working surface may take the form of particulate matter which can permeate through the surrounding environment, often times coming to rest on undesired nearby non-working surfaces, such as countertops or furniture.
The sanding system of the present invention is adapted to be attached or incorporated into a powered self-moving tool, such as an electric reciprocating power tool, that actuates a sanding portion of the sanding system to sand or smooth a working surface, such as a wooden board or cured drywall compound located along a seam (such as at an inside corner) between adjacent drywall panels. A vacuum portion defines a pair of spaced apart inlets that recover dust and debris produced from the sanding process. While sanding, the sanding portion is moved to cover one inlet at a time, leaving the other inlet uncovered. As a result, the location of the uncovered inlet continuously alternates between the locations of each inlet. Because at least one inlet is always covered, the uncovered inlet will have increased suction power, thus resulting in effective recovery of dust and debris from continuously alternating areas of the working surface. An alignment heel that is spaced apart from the sanding and vacuum portions can be moved along the working surface to ensure proper contact and uniform pressure is maintained between the sanding portion and the working surface to reduce the likelihood of inadvertently creating gouges or other imperfections during the sanding process.
According to one form of the invention, a sanding system for sanding a working surface includes a vacuum portion having first and second vacuum inlets that direct a suction force to recover dust and debris from the working surface being sanded. A sanding portion to which an abrasive article (such as sandpaper) may be secured is movable relative to the vacuum portion between first and second positions. In the first position, the first vacuum inlet is at least partially covered by the sanding portion and the second vacuum inlet is at least partially uncovered, and in the second position the second vacuum inlet is at least partially covered by the sanding portion and the first vacuum inlet is at least partially uncovered.
In one aspect, the sanding portion includes a pair of backing surfaces oriented at an angle relative to one another and connected along a longitudinal axis. Optionally, the backing surfaces are oriented at a 90 degree angle relative to one another to more effectively sand adjacent surfaces at and/or near an internal corner.
In another aspect, the backing surfaces include tapered portions that are oriented at an angle of less than 90 degrees relative to one another.
In yet another aspect, the first and second vacuum inlets are located entirely inboard of the sanding portion in both latitudinal and transverse directions.
In still another aspect, the sanding system includes an attachment that protrudes through a hole defined by the vacuum portion to connect the sanding portion to a reciprocating part of a reciprocating power tool.
In a further aspect, the vacuum portion may be secured to a non-reciprocating part of the reciprocating power tool.
In yet a further aspect, the sanding system includes an alignment heel that is spaced apart from the sanding and vacuum portions, and is secured to the non-reciprocating part of the power tool. The alignment heel slides along the working surface during the sanding process to aid in maintaining a desired alignment and uniform pressure between the sanding portion and the working surface. The alignment heel and the sanding portion each terminate along a common longitudinal axis. Optionally, the alignment heel includes a pair of surface guides angled relative to one another and connected along the common longitudinal axis. Additionally, the surface guides may have the same angle relative to one another as the backing surfaces have relative to one another, such as 90 degrees.
According to another form of the invention, a sanding system for sanding a working surface includes an alignment heel with a surface guide that may slide along the working surface substantially without removing material from the working surface. The alignment heel is spaced apart from and coupled to a sanding portion having a backing surface, where the sanding portion is used to sand the working surface. Both the surface guide and the backing surface are coplanar in a contact plane.
In one aspect, the surface guide includes a pair of surface guides angled relative to one another and connected along a common longitudinal axis.
In another aspect, the sanding portion includes a pair of backing surfaces angled relative to one another and connected along the common longitudinal axis. The backing surfaces may have the same angle relative to one another as the surface guides have relative to one another, which may optionally be 90 degrees, such that both the backing surfaces and the surface guides make slidable contact with a pair of adjacent surfaces at and/or near an internal corner.
In yet another aspect, the surface guide is a felt surface that slides along the working surface.
In still another aspect, the alignment heel may be attached to a non-moving portion of a power tool, and the sanding portion may be attached to a moving portion of the power tool.
In a further aspect, the alignment heel includes a retention feature that frictionally engages with the non-moving portion of the power tool to secure the power tool to the alignment heel.
Thus, the sanding system of the present invention provides an effective way to sand a working surface, such as dried drywall compound or “mud” located along a wall seam. The sanding system includes a sanding portion that moves relative to a vacuum portion to cover and uncover one vacuum inlet at a time in an alternating fashion, the vacuum portion having a pair inlets spaced apart from one another. This results in increased suction power at alternating positions (the position of each inlet) to more effectively recover dust and debris from the working surface. The precision and quality of the sanding process is enhanced by an alignment heel spaced from the sanding and vacuum portions. The alignment heel slidably contacts the working surface to improve the stability and alignment of the sanding portion relative to the working surface, thereby reducing the likelihood of creating inadvertent gouges or other imperfections in the working surface due to uneven contact or pressure between the sanding portion and the working surface.
These and other objects, advantages, purposes and features of the present invention will become apparent upon review of the following specification in conjunction with the drawings.
Referring now to the drawings and the illustrative embodiments depicted therein, a sanding system 20 is adapted to uniformly sand and recover sanding debris from a working surface such as the surface of a wall 22 shown in
Referring now to
Vacuum portion 30 includes an enclosure 44 located inboard of sanding portion 24 in both a latitudinal direction and a transverse direction, such as shown in
With reference to
Anterior portion 66 also includes a pair of upright supports 72a, 72b located on opposite sides of retention cavity 70. Supports 72a, 72b each define a pair of bolt holes 74 for securing a hose mount 76 that supports and directs vacuum hose 50 away from power tool 28 and sanding system 24 to limit potential interference or obstruction by vacuum hose 50 in the sanding process. Hose mount 76 may be secured to either support 72a, 72b depending on a user's preference. Alternatively, a clamp or clip fastener could be used to secure vacuum hose 50 to alignment heel 36.
As shown in
Sanding portion 24 reciprocates through a neutral or central position (
Because inlets 34a, 34b are spaced apart near opposing ends of enclosure 44, the suction force is rapidly and continuously redirected between alternating locations based on the frequency of reciprocation of sanding portion 24. These characteristics result in increased suction power at both inlets 34a, 34b to more effectively recover dust and debris from the working surface as the user is sanding the working surface. Material abraded away or otherwise separated from the working surface during the sanding process is suctioned or vacuumed into inlets 34a, 34b to enter enclosure 44. From enclosure 44, the material moves through duct 48 and then vacuum hose 50. Vacuum hose 50 may be fluidly connected to a vacuum such as a shop vacuum having a reservoir to store recovered material. It should be appreciated that an alternative vacuum portion may include more than two inlets and/or inlets that are arranged in a different configuration such that a sanding portion still moves to alternatively cover and uncover one or more inlets at various locations.
The above-described debris collection process is achieved in part due to the position of vacuum portion 30 relative to sanding portion 24. As previously noted, enclosure 44 is located inboard of sanding portion 24 in both the latitudinal direction and the transverse direction, and inlets 34a, 34b are defined by distal side 44a of enclosure 44. As shown in
Alignment heel 36 includes surface guides 60, 62 to provide sanding system 20 with a second area of contact with wall 22 that is spaced from and aligned with sanding portion 24 (the first area of contact). Outboard portions of alignment heel 36 and sanding portion 24 terminate in common contact planes. That is, the outer sides 60a, 62a of each guide 60, 62 are coplanar, in respective contact planes, with respective contact portions 38a, 40a of sanding portion 24. Guides 60, 62 are also made of or covered with a smooth and/or soft material, such as felt, to allow them to slide along a working surface without scratching, damaging, or otherwise substantially removing material from working surface, but that also provides guides 60, 62 with a suitable level of friction to prevent sudden movements or inadvertent slipping of guides 60, 62 relative to the working surface during the sanding process. As a result, alignment heel 36 promotes proper alignment and uniform contact between sanding portion 24 and wall 22 by both stabilizing and constraining undesired movements of sanding portion 24. As discussed above, a sanding portion may be equipped with backing pads having varying geometric profiles that are designed for sanding surface areas other than an internal corner. Similarly, an alignment heel may also be equipped with surface guides having geometry that varies depending on the particular backing pads being used for sanding such that any given combination of backing pads/surface guides each terminate in an outboard direction in one or more common contact planes.
Accordingly, the sanding system of the present invention provides an effective way to sand a working surface while simultaneously vacuuming away sanding dust or debris, and maintaining desired alignment with the surface(s) being sanded. A sanding portion is attached to a power tool that reciprocates or moves the sanding portion to sand the working surface. The sanding portion moves relative to a vacuum portion during the sanding process to alternatively cover and uncover a pair of spaced apart inlets that are used to recover debris from the working surface. An alignment heel is spaced apart from and aligned with the sanding portion to promote stability and uniform contact pressure between the sanding portion and the working surface during the sanding process.
Changes and modifications in the specifically described embodiments may be carried out without departing from the principles of the present invention, which is intended to be limited only by the scope of the appended claims, as interpreted according to the principles of patent law including the doctrine of equivalents.